/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.uber.athenax.vm.compiler.parser;

import org.apache.calcite.sql.SqlCall;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlNodeList;
import org.apache.calcite.sql.SqlOperator;
import org.apache.calcite.sql.SqlSpecialOperator;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;

import java.util.Arrays;
import java.util.List;

public class SqlCreateFunction extends SqlCall {
  private static final SqlSpecialOperator OPERATOR = new SqlSpecialOperator("UDF", SqlKind.OTHER_DDL);
  private final SqlIdentifier dbName;
  private final SqlIdentifier funcName;
  private final SqlNode className;
  private final SqlNodeList jarList;

  public SqlCreateFunction(SqlParserPos pos, SqlIdentifier dbName,
                           SqlIdentifier funcName, SqlNode className, SqlNodeList jarList) {
    super(pos);
    this.dbName = dbName;
    this.funcName = funcName;
    this.className = className;
    this.jarList = jarList;
  }

  @Override
  public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
    UnparseUtil u = new UnparseUtil(writer, leftPrec, rightPrec);
    u.keyword("CREATE", "FUNCTION");
    if (dbName != null) {
      u.node(dbName).keyword(".");
    }
    u.node(funcName).keyword("AS").node(className);
    if (jarList != null) {
      u.keyword("USING").nodeList(jarList);
    }
  }

  @Override
  public SqlOperator getOperator() {
    return OPERATOR;
  }

  @Override
  public List<SqlNode> getOperandList() {
    return Arrays.asList(dbName, funcName, className, jarList);
  }

  public SqlIdentifier dbName() {
    return dbName;
  }

  public SqlIdentifier funcName() {
    return funcName;
  }

  public SqlNode className() {
    return className;
  }

  public SqlNodeList jarList() {
    return jarList;
  }
}
